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Bell RT-66/GRC Technical Manual
Receiver-transmitters
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Table Of Contents
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Contents
Table of Contents
Troubleshooting
Table of Contents
Contents
General Principles
Back-Pressure Arm Lift Method
Compression Phase
Expansion Phase
Typical Receiver-Transmitter Over-All View
Introduction
General
Description and Data
Forms and Records
Frequency Spectrum Chart
System Application
Basic Arrangement
References
Technical Characteristics
Over-All Equipment
Description of Receiver-Transmitter
Controls, Instruments and Connectors
Additional Equipment Required
Spare Parts
Miscellaneous Accessory Equipment
Theory of Receiver-Transmitter
Transmitter Carrier Frequency and Receiver I-F Generation
Tuning Arrangement
Tuned Circuits
Mechanical Coupling and Gearing Arrangement
Continuously Variable Tuning
Number of Detent Settings
Preselection of Detented Channels
Antenna Trimming Mechanism
Transmitter Circuits, Block Diagram
Receiver-Transmitter Control Circuits
Automatic Frequency Control
Sidetone
Ringer Circuit
Receiver Circuits, Block Diagram
Test Circuit
Fixed Second I-F Amplifier and Limiter
Discriminator
Squelch Oscillator V-103
Stage Analysis
Microphone Input Circuit
Modulation
Crystal Oscillator
Harmonic Generator
Transmitter Mixer V-6
Transmitter R-F Ampplifier V-7 and V-8
Transmitter Drivers V-9 and V10
Transmitter Power Amplifier
Receiver R-F Amplifier V-1
Receiver First Mixer V-2
Variable I-F Amplifiers V-107 and V-108
Receiver Oscillator V101
Receiver Second Mixer
Fixed I-F Amplifier Limiter Circuit
Second Limiter Stage V-112
Limiting Action
Circuit Differences
Discriminator Circuit V-113 and V-114
Discriminator Function
Circuit Arrangement
Discriminator Theory, Vector Diagram
Discriminator Characteristics
Measuring Points
First Audio Amplifier V-115
Discriminator Output Circuits
Power Audio Amplifier V-116
Retransmit Audio Amplifier V-102
Squelch Circuit V-103
Control Circuits
Filament Circuits
Relay O-1
Plate Supply Circuits
Receiver Supply Circuits
Transmitter Supply Circuits
Measuring Circuit
System Wiring
R-F Chassis, Component Side
Field Maintenance
Troubleshooting
Short-Circuit Checks
Operational Checks
Test Equipment and Tools Required for Troubleshooting
Checking Key Circuits for Shorts
Voltage Measurements
Additional Checks
Antenna Load
Audio Devices
Power Supply
Purpose and Use of Operational Check Chart
Additional Trouble Secionalization Data
Circuit Sections for Operational Checks
Use of Operational Check Chart
Receiver-Transmitter Tracking Check Chart
Tracking Charts
Analysis of Measurement Data
Filament Circuit Trouble Localization Chart
Signal Substitution
Signal Tracing in Receiver
Stage Gain Chart
Resistance Measurements
D-C Voltage Measurements
Check of Interrupt Strapping Connections
Repairs
Replacement of Parts
Tagging Leads
Reassembling the Equipment
Removal of R-F Chassis
Sockets
Stand-Off Insulators
Panel Connectors
Replacement of Variable Capacitor C-17
Antenna Tuning Capacitor Assembly
Replacement of Components in Tuning Unit Cans
Crystal Switch Assembly
Meter
Dial-Drive Mechanism
Replacement of Dial Lamp
Terminal Boards, Component Location Diagrams
Lubrication and Weatherproofing
Rustproofing
Tropical Maintenance
Winter Maintenance
Alinement Procedures
Test Equipment Required for Alinement
Initial Procedures
Receiver Alinement
Adjustment of Tenth Mcs Dial Detent Screws
Variable I-F Amplifier
Transmitter Alinement
Transmitter Oscillator V-104A
Final Testing
Over All Receiver Sensitivity
Variable L-F Selectivity
Spurious Response
Calibration
Check of Bandwidth
Fixed I-F Amplifier
Over-All Receiver
Repacking for Shipment or Limited Storage
Demolition of Material to Prevent Enemy Use
Identification Table of Parts
Resistor Color Codes
Capacitor Color Codes
Index
1St Fixed if
Quick Links
Table of
Contents
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Table of Contents
Troubleshooting
Field maintenance
76
Test equipment and tools required for troubleshooting
77
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This manual is also suitable for:
Rt-67/grc
Rt-68/grc
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